The 18.6‐year lunar nodal cycle and surface temperature variability in the northeast Pacific
The 18.6‐year lunar nodal cycle and surface temperature variability in the northeast Pacific
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DOI：
10.1029/2006jc003671
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发表时间：
2007-02
影响因子：
--
通讯作者：
S. Mckinnell;W. Crawford
中科院分区：
文献类型：
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作者：
S. Mckinnell;W. Crawford
[1] 18.6 年的月交点周期 (LNC) 是 400 年来北美西海岸冬季（一月）气温和海水温度的一个显着特征。然而，最近的大部分温度变化也可以用与 PNA 遥相关相关的风型来解释。在阿拉斯加州锡特卡（北纬 57°）和不列颠哥伦比亚省北部的附近气象站，在漫长的气象记录中，1 月 PNA 指数占 1 月平均气温的 70% 以上。看来该地区 1 月份气温的 LNC 信号并不是独立于 PNA 的，而是它的一个组成部分。锡特卡气温记录、不列颠哥伦比亚省海岸海温和 PNA 指数与 LNC 存在显着的互相关性，LNC 出现滞后 2 年，LNC 领先。随着纬度的降低，冬季 PNA 格局的影响减弱，但 LNC 分量却没有。它似乎是斯克里普斯码头和加州海流系统长期海表温度变化的一个重要特征。 LNC 在北美西部的代理气温中也出现了百年尺度的现象。 LNC 调节的表面温度与涉及盆地尺度遥相关的过程之间的联系扩大了近因机制可能位于远离其在东北太平洋的表达的可能性。大气中昼夜潮汐信号的一些最大潜在来源位于西太平洋；鄂霍次克海和印度尼西亚群岛。
[1] The 18.6-year lunar nodal cycle (LNC) is a significant feature of winter (January) air and sea temperatures along the North American west coast over a 400-year period. Yet much of the recent temperature variation can also be explained by wind patterns associated with the PNA teleconnection. At Sitka, Alaska, (57°N) and nearby stations in northern British Columbia, the January PNA index accounts for over 70% of average January air temperatures in lengthy meteorological records. It appears that the LNC signal in January air temperatures in this region is not independent of the PNA, but is a component of it. The Sitka air temperature record, along with SSTs along the British Columbia coast and the PNA index have significant cross-correlations with the LNC that appear at a 2-year lag, LNC leading. The influence of the PNA pattern declines in winter with decreasing latitude but the LNC component does not. It appears as a significant feature of long-term SST variation at Scripps Pier and the California Current System. The LNC also appears over centennial-scales in proxy temperatures along western North America. The linkage of LNC-moderated surface temperatures to processes involving basin-scale teleconnections expands the possibility that the proximate mechanism may be located remotely from its expression in the northeast Pacific. Some of the largest potential sources of a diurnal tidal signal in the atmosphere are located in the western Pacific; the Sea of Okhotsk and the Indonesian archipelago.